(;AB[rp]AB[sp]AB[qq]AB[rr]AB[pr]AB[oq]AB[nq]AB[mq]AB[lp]AB[lo]AB[ln]AB[km]AB[jm]AB[hm]AB[il]AB[jk]AB[kk]AB[lk]AB[mk]AB[nl]AB[pm]AB[rm]AW[mp]AW[np]AW[op]AW[pp]AW[pq]AW[qp]AW[ro]AW[so]AW[qo]AW[mo]AW[mm]AW[lm]AW[mn]AW[jl]AW[kl]AW[ll]AW[on]AW[kn]AW[jp]C[White first to live! Please play at A to start! (Ko is good enough)]LB[jn:A]AP[goproblems];W[jn];B[im] (;W[lq];B[kq] (;W[lr];B[kp] (;W[kr];B[jq]C[White fails!];W[or];B[nr];W[os];B[ns];W[rq];B[sq];W[rs];B[qs]C[Wrong!]) (;W[or];B[nr] (;W[os] (;B[ps];W[rq];B[sq];W[rs];B[sr];W[qr];B[ns];W[rq]C[Correct! white gets a ko to live!RIGHT]) (;B[ns];W[jq];B[kr];W[ks] (;B[jr];W[ir];B[js];W[ls]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]) (;B[js];W[ls];B[jr];W[ir]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]))) (;W[ms];B[os];W[jq];B[kr] (;W[ks];B[jr];W[ir];B[js];W[is]C[White gets a ko for living!RIGHT]) (;W[jr];B[ks];W[js];B[mr]C[White is dead!]))) (;W[rq];B[sq];W[rs];B[qr];W[or];B[nr];W[os] (;B[ps];W[sr]C[Correct! white gets a ko to live!RIGHT]) (;B[ns];W[jq];B[kr];W[ks] (;B[jr];W[ir];B[js];W[ls]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]) (;B[js];W[ls];B[jr];W[ir]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]))) (;W[jq];B[kr];W[or];B[nr];W[os];B[ls]C[Wrong, white can not do anything now.])) (;W[or];B[lr];W[rq];B[sq];W[rs];B[qs]C[Wrong!]) (;W[rq];B[sq];W[rs] (;B[qs] (;W[or];B[lr]C[Wrong!]) (;W[lr];B[kp];W[or];B[nr];W[os];B[ns];W[jq];B[kr];W[ks] (;B[jr];W[ir];B[js];W[ls]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]) (;B[js];W[ls];B[jr];W[ir]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]))) (;B[qr];W[lr];B[kp];W[or];B[nr];W[os] (;B[ps];W[sr]C[Correct! white gets a ko to live!RIGHT]) (;B[ns];W[jq];B[kr];W[ks] (;B[jr];W[ir];B[js];W[ls]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]) (;B[js];W[ls];B[jr];W[ir]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]))))) (;W[rq];B[sq];W[rs] (;B[sr];W[lq];B[kq];W[lr];B[kp];W[or];B[nr];W[os] (;B[ns];W[jq];B[kr];W[ks];B[jr];W[ir];B[js];W[ls]LB[mr:A]LB[ms:A]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]) (;B[ps];W[qr];B[ns];W[rq]C[Correct! white gets a ko to live!RIGHT])) (;B[qs];W[lq];B[kq];W[lr];B[kp];W[or];B[nr];W[os];B[ns];W[jq];B[kr];W[ks] (;B[jr];W[ir];B[js];W[ls]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]) (;B[js];W[ls];B[jr];W[ir]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A])) (;B[qr];W[lq];B[kq];W[lr];B[kp];W[or];B[nr];W[os] (;B[ps];W[sr]C[Correct! white gets a ko to live!RIGHT]) (;B[ns];W[jq];B[kr];W[ks] (;B[jr];W[ir];B[js];W[ls]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]) (;B[js];W[ls];B[jr];W[ir]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A])))) (;W[or] (;B[nr];W[lq];B[kq];W[lr];B[kp];W[os] (;B[ps];W[rq];B[sq];W[rs];B[ns];W[sr]C[Correct! white gets a ko to live!RIGHT]) (;B[ns];W[jq];B[kr];W[ks] (;B[jr];W[ir];B[js];W[ls]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]) (;B[js];W[ls];B[jr];W[ir]C[Correct! Since black can't play at A, white kills black K1 group and lives.RIGHT]LB[mr:A]LB[ms:A]))) (;B[lq] (;W[ps];B[qr];W[sr];B[rq];W[rs];B[nr]C[white is dead!]) (;W[rq];B[sq];W[rs] (;B[qr];W[sr]C[Correct! white gets a ko to live!RIGHT]) (;B[qs])))) (;W[rs];B[rq]C[Wrong! nothing will happen!]) (;W[qr];B[qs]C[Wrong!]))